Anyone got one of these? The wiring on them is a bit different than the older DIS-4 HO with the dipswitches (this one has rotary knobs for the settings), and like a dumbass I managed to misplace the instructions after I installed it in the car. MSD still has the old instructions only on their website.

I need to know which wire on it is the Tach wire. On the old one it looks like the tach wire plugs into a little connector on the DIS-4, but on this one there is an additional wire coming out of the unit, and it also has that black slip-in connector on it. Is the slip-in connector the tach lead, or the additional wire (pink?).

Since nobody replied, I'll answer my own question and provide some additional info...

Tach output from the MSD DIS-4 Plus is the same as on the non-plus version. There's a spade connector that you need to plug a connector into. My MSD box didn't come with one, but a standard crimp-on one that I had laying around worked fine once I trimmed the insulating boot off it.

It'll also work totally fine if you connect the tach output straight to the tach in the car, without the expensive and bulky MSD "tach adapters". Just cut the white wire on the flat connector at the stock ignition power transistor (below the stock coils) and connect the tach output to the harness-side of the wire (not the PTU side). Awww yeah, tach working again.

It has rotary dials for adjustment instead of the dipswitches. It has an additional "nitrous retard" so when you are spraying it can pull out timing at the top-end (programmable retard amount). Has an "ignition kill" wire that when activated will disable spark for anti-theft purposes.

I'm sure the 2-step and revlimits are more granular since the rotary dials let you dial your limits by increments of 100 rpm. I think the old one with the dipswitches was more coarse than that.

THANKS to Matt Jannusch for this, I am unfu%^ing the rats nest of wiring on my 94 VR4 (FINALLY running again but some issues LOL surprise), and was looking at all this, found this message and how to get rid of the two HEAVY (~2.6 lbs total) STUPID MSD TACH ADAPTERS that Matt laid out so nicely.
It WORKS!!! WOW THIS IS SO GREAT I'VE HATED THOSE THINGS FOR A DECADE+!!!

Quoting Matt:

"Tach output from the MSD DIS-4 Plus is the same as on the non-plus version. There's a spade connector that you need to plug a connector into. My MSD box didn't come with one, but a standard crimp-on one that I had laying around worked fine once I trimmed the insulating boot off it.
It'll also work totally fine if you connect the tach output straight to the tach in the car, without the expensive and bulky MSD "tach adapters". Just cut the white wire on the flat connector at the stock ignition power transistor (below the stock coils) and connect the tach output to the harness-side of the wire (not the PTU side). Awww yeah, tach working again."
---------------------------
THANKS MATT!!!!!!!!!!!!!!!!!!!!!!!!!! AND 3SI for KEEPING ALL THIS INFO!!!!!!!!!!!
Jack T.

Register Now

In order to be able to post messages on the 3000GT/Stealth International Message Center forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.
Free email addresses do not work(yahoo, hotmail, gmail,...)
We are currently being blocked by AOL so any AOL based address may not work(aol.com, aim.com, netscape.net, cs.com)

Email Address:

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.

AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.